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Effect of Airflow Non-Uniformities on the Thermal Performance of Water–Air Heat Exchangers—Experimental Study and Analysis

Author

Listed:
  • Mahmoud Khaled

    (Energy and Thermofluid Group, The International University of Beirut BIU, Beirut Campus, Beirut P.O. Box 146404, Lebanon
    Interdisciplinary Energy Research Institute (PIERI), University Paris Diderot, Sorbonne Paris Cite, 75013 Paris, France)

  • Mostafa Mortada

    (Energy and Thermo-Fluid Group, Lebanese International University LIU, Bekaa Campus, Bekaa 1801, Lebanon)

  • Jalal Faraj

    (Energy and Thermofluid Group, The International University of Beirut BIU, Beirut Campus, Beirut P.O. Box 146404, Lebanon)

  • Khaled Chahine

    (College of Engineering and Technology, American University of the Middle East, Kuwait)

  • Thierry Lemenand

    (LARIS EA 7315, Polytech Angers, University of Angers, 49000 Angers, France)

  • Haitham S. Ramadan

    (ISTHY, l’Institut International sur le Stockage de l’Hydrogène, 90400 Meroux-Moval, France
    Electrical Power and Machines Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt)

Abstract

The thermal performance of fin-and-tube heat exchangers (HX) is a crucial aspect in a multitude of applications and fields; several design and operational parameters influence this performance. This study focuses on the issue of flow maldistribution and its effect on the HX thermal performance. For this purpose, an experimental setup is designed and implemented to emulate the conditions under which an automotive heat exchanger operates in regard to the non-uniform upstream airflow velocity distribution over the HX surface. The setup allows obtaining various configurations of airflow velocity non-uniformity of some desired mean velocity and standard deviation. The experimental results reveal that a higher degree of non-uniformity (higher standard deviation of the velocity distribution) causes an increased deterioration of the HX thermal performance. For example, at a water flowrate of 200 L/h and a mean airflow velocity of 2 m/s, increasing the standard deviation from 0 to 2 m/s (i.e., moving from the lowest to highest degrees of non-uniformity) causes a total deterioration of 27% in the performance (3.78 to 2.75 kW, respectively), which can also be observed in the increased level of outlet water temperature (53.8 to 58.2 °C, respectively). The obtained results confirm the numerical results reported in the literature.

Suggested Citation

  • Mahmoud Khaled & Mostafa Mortada & Jalal Faraj & Khaled Chahine & Thierry Lemenand & Haitham S. Ramadan, 2022. "Effect of Airflow Non-Uniformities on the Thermal Performance of Water–Air Heat Exchangers—Experimental Study and Analysis," Energies, MDPI, vol. 15(21), pages 1-14, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8120-:d:959338
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    References listed on IDEAS

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    1. Xiaodong Liu & Hongqiang Guo & Xingqun Cheng & Juan Du & Jian Ma, 2022. "A Robust Design of the Model-Free-Adaptive-Control-Based Energy Management for Plug-In Hybrid Electric Vehicle," Energies, MDPI, vol. 15(20), pages 1-24, October.
    2. Khaled, Mahmoud & Harambat, Fabien & Hage, Hicham El & Peerhossaini, Hassan, 2011. "Spatial optimization of an underhood cooling module – Towards an innovative control approach," Applied Energy, Elsevier, vol. 88(11), pages 3841-3849.
    3. Aiguo Zhu & Haider Ali & Muhammad Ishaq & Muhammad Sheraz Junaid & Jawad Raza & Muhammad Amjad, 2022. "Numerical Study of Heat and Mass Transfer for Williamson Nanofluid over Stretching/Shrinking Sheet along with Brownian and Thermophoresis Effects," Energies, MDPI, vol. 15(16), pages 1-21, August.
    4. Le Zhang & Huixing Zhai & Jiayuan He & Fan Yang & Suilin Wang, 2022. "Application of Exergy Analysis in Flue Gas Condensation Waste Heat Recovery System Evaluation," Energies, MDPI, vol. 15(20), pages 1-12, October.
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